My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX147ACAP+
- Part No.:
- MAX147ACAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX147ACAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX147ACAP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. It operates from a single +2.7V to +5.25V supply, requires an external reference, and delivers 133ksps conversion rate with ±0.5 LSB INL and 73dB SINAD - used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX147ACAP+ datasheet, MAX147ACAP+ pinout, MAX147ACAP+ application, or MAX147ACAP+ equivalent, key selection criteria include its external-reference dependency, 20-pin SSOP package, 1µA power-down current, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX147ACAP+ employs successive-approximation architecture with a dedicated track/hold circuit acquiring input signals over 1.5µs. Its analog front-end supports pseudo-differential sampling across eight channels, with COM pin serving as zero-code reference in single-ended mode and enabling bipolar range (±VREF/2) when configured.
Conversion timing is governed by either internal clock or externally supplied SCLK (up to 2MHz), with control-byte programming (8-bit) selecting channel, polarity, input mode, and power state. The SSTRB output pulses synchronously - one clock cycle before MSB output in external-clock mode - enabling precise DSP timing alignment without additional logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization in precision measurement systems. |
| Conversion Rate | 133ksps - enables real-time sampling of audio-band and control-loop signals without undersampling artifacts. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error after calibration, critical for closed-loop feedback accuracy. |
| SINAD | 73 dB - corresponds to ~11.8 effective bits at 10kHz input, supporting dynamic range requirements in medical sensor interfaces. |
| Supply Range | +2.7V to +5.25V - allows direct integration with 3.3V or 5V microcontroller systems without level-shifting or LDO overhead. |
| Power-Down Current | 1 µA - enables ultra-low-quiescent operation between samples in energy-constrained IoT edge nodes. |
| Reference Requirement | External VREF (2.500V typical) - mandates external precision reference but avoids internal reference drift limitations in wide-temperature industrial use. |
Pinout & Package
MAX147ACAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for compact PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended or four differential input pairs (CH0/CH1, CH2/CH3, etc.) - software-selectable via control byte for flexible sensor multiplexing. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB to prevent gain/offset errors during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low for full shutdown (1µA), float for external compensation mode, or pull high to enable internal buffer compensation - no external pull-up/down required. |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference; internal buffer disabled by tying REFADJ to VDD - eliminates need for external op-amp buffering. |
| REFADJ (Pin 12) | Reference buffer adjustment | Connect to VDD to disable internal reference buffer; otherwise enables ±1.5% fine-tuning of buffered VREF in MAX146 variants (not used in MAX147ACAP+). |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge - defines channel, polarity, input mode, and clock/power-down configuration. |
| SCLK (Pin 19) | Serial clock input | Drives both data transfer and conversion timing in external-clock mode; 40–60% duty cycle required for reliable SAR operation. |
| CS (Pin 18) | Chip select | Active-low enable - DOUT enters high-impedance state when CS is high, allowing multi-device SPI bus sharing. |
| DOUT (Pin 15) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge - synchronized to SSTRB pulse for deterministic DSP capture timing. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high for one SCLK period before MSB output in external-clock mode - directly interfaces TMS320-family DSPs without glue logic. |
| AGND/DGND (Pins 13/14) | Analog/digital ground | Separate ground pins require star-point connection to minimize digital noise coupling into analog measurement path. |
| VDD (Pin 20) | Positive supply | Single 2.7V–5.25V rail powers analog and digital sections - no separate AVDD/DVDD required, simplifying power design. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Single-ended (8-channel) or differential (4-channel) with unipolar/bipolar selection per conversion - eliminates hardware reconfiguration for multi-sensor platforms. |
| Low-power shutdown states | 1µA full power-down and fast power-down options - enables adaptive sampling in battery-powered devices without sacrificing wake-up latency. |
| TMS320-family DSP interface | Dedicated SSTRB output synchronized to conversion start - removes need for external timing logic or GPIO-based handshaking in motor control and audio processing systems. |
| High-accuracy analog front-end | ±0.5 LSB INL, ±0.5 LSB DNL, and 73dB SINAD at 10kHz - meets Class I medical instrument accuracy requirements per IEC 60601-2-51. |
| Robust input protection | Internal clamping diodes allow analog inputs to swing from AGND−0.3V to VDD+0.3V - withstands transient overvoltage in industrial fieldbus environments. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-operated environmental sensor node recording temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple sensors using time-multiplexed single-ended acquisition, with automatic power-down between readings. Use Value: 1µA shutdown current extends coin-cell life beyond 1 year; 133ksps rate captures transient events like rapid dew-point shifts without aliasing. | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with real-time ST-segment analysis. IC Role / Device Role / Timing Role: Configured for CH1/CH2 differential input in bipolar mode, sampling at 1ksps with SSTRB-triggered DMA transfers to ARM Cortex-M4. Use Value: ±0.5 LSB INL ensures sub-10µV baseline stability; 73dB SINAD preserves QRS complex fidelity for arrhythmia detection algorithms. |
| Battery-Powered Test Equipment | Process Control Transmitters |
Use Scenario: Pocket-sized multimeter with auto-ranging voltage/current/resistance measurement and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Switches between unipolar 0–2.5V (voltage), ratiometric current sense (differential), and resistance bridge (bipolar) using same hardware platform. Use Value: Single-supply 2.7–5.25V operation eliminates dual-rail requirement; software-selectable modes reduce BOM count by 3x versus discrete ADC solutions. | Use Scenario: 4–20mA loop-powered temperature transmitter interfacing RTD and thermocouple sensors in hazardous areas. IC Role / Device Role / Timing Role: Digitizes isolated analog inputs via CH0–CH3 differential pairs, with conversion results transmitted via HART protocol stack. Use Value: External reference support enables traceable calibration to NIST standards; ±1.5% REFADJ adjustability accommodates field-trimmed reference tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply, 12-bit, SPI interface, but no SSTRB output and only 50ksps max rate - lacks TMS320 synchronization capability. | Requires external timing logic for DSP interfacing; unsuitable for real-time motor control loops demanding sub-10µs jitter. | Select MAX147ACAP+ when SSTRB-driven deterministic capture is required; choose ADS7822U for cost-sensitive, lower-speed sensor hubs. |
| AD7490BRUZ | 12-bit, 16-channel, 1MSPS, SPI-compatible, but requires 4.5–5.5V supply - incompatible with 3.3V-only systems and lacks 2.7V operation. | Higher speed trades off power efficiency: 1.5mA active current vs. MAX147ACAP+'s 1.2mA at 133ksps - impractical for coin-cell designs. | Choose MAX147ACAP+ for ultra-low-voltage, low-power portable instrumentation; AD7490BRUZ fits high-throughput industrial PLC modules. |
Compared with ADS7822U and AD7490BRUZ, MAX147ACAP+ uniquely balances 2.7V operation, 1µA shutdown, and SSTRB-synchronized output - making it the only option that satisfies simultaneous requirements for battery life, DSP timing integrity, and wide supply flexibility in portable medical devices.
Availability
MAX147ACAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX147ACAP+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX146/MAX147 product line was engineered for low-power, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing single-supply operation, software-flexible input configurations, and direct microprocessor/DSP interfacing.
FAQ
What is the reference voltage requirement for MAX147ACAP+?
The MAX147ACAP+ requires an external precision reference applied to the VREF pin, typically 2.500V ±0.5%. Unlike the MAX146, it does not include an internal reference. The REFADJ pin must be tied to VDD to disable the internal reference buffer, as confirmed in the datasheet's "EXTERNAL REFERENCE AT VREF" section and Pin Description table.
Does MAX147ACAP+ support differential input mode?
Yes, MAX147ACAP+ supports pseudo-differential input mode using channel pairs CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Configuration is done via the SGL/DIF bit (bit 2) and SEL[2:0] bits in the 8-bit control byte. In this mode, the device samples the voltage difference while maintaining single-ended sampling architecture, as detailed in Tables 2 and 3 and the "Pseudo-Differential Input" section.
What is the function of the SHDN pin on MAX147ACAP+?
The SHDN pin on MAX147ACAP+ provides three-level control: pulled low for full shutdown (1µA), floated for external compensation mode (reference buffer enabled with external capacitor), or pulled high to force internal compensation mode. This eliminates need for external pull resistors and enables flexible power management strategies without firmware overhead.
Can MAX147ACAP+ interface directly with TMS320-family DSPs?
Yes, MAX147ACAP+ interfaces directly with TMS320-family DSPs using the SSTRB (serial strobe) output. In external clock mode, SSTRB pulses high for one SCLK period immediately before the MSB of the 12-bit result appears on DOUT - providing hardware-synchronized capture timing without external logic or GPIO polling, as specified in the "Typical Operating Circuit" and "How to Start a Conversion" sections.
What package type is used for MAX147ACAP+?
MAX147ACAP+ uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, as indicated by the "ACAP" suffix in the part number and confirmed in the "Ordering Information" table. This surface-mount package supports automated assembly and offers better thermal performance than DIP variants for high-density portable designs.
MAX147ACAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX147ACAP+ FAQ
1.How can I place an order for MAX147ACAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX147ACAP+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX147ACAP+ reliable?
The price and inventory of MAX147ACAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX147ACAP+ is usually 5 days.
3.What payment methods are accepted for MAX147ACAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX147ACAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX147ACAP+?
MAX147ACAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX147ACAP+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX147ACAP+?
For technical support, including MAX147ACAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX147ACAP+ requirements.
6.How does Aetrix verify that MAX147ACAP+ is sourced from the original manufacturer or authorized distributors?
All MAX147ACAP+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX147ACAP+ meets industry standards.
7.What is the process for return or replacement of MAX147ACAP+?
All MAX147ACAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX147ACAP+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX147ACAP+ part is unused and in its original packaging.
Return procedure for MAX147ACAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX147ACAP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
